2005, Rickford Grant, Linux Made Easy: The Official Guide to Xandros 3 for Everyday Users, San Francisco: No Starch Press, ISBN1593270577, page 182:

In the menu that then pops out, select the number of degrees you want to rotate the image (90° if the image is lying on its left side, 180° if the image is upside down, or 270° if the image is lying on its right side).